Analog spice implementation of multi-frequency ultrasound system

Abstract

The emergence of ultrasound applications raises the need of reliable transducer to comply with that purpose. As polymer material being popular in medical ultrasound, there are chances to combine it with former piezoelectric ceramic material in designing diagnostic transducer to get hybrid characteristics required for multi-frequency application. In this work, SPICE model of ceramic-polymer piezoelectric has been described. Using Leach’s approach, the modeled transducer covers triple peaks resonances. Electroacoustic circuit simulation level shows that by hybridization, characteristics of both materials are providing a satisfying performance for multi-frequency transducer. With signal conditioner circuit, complete analog system for ultrasound has also been developed. As initial, transducer test for ceramic and polymer model were generated. By filtering and amplifying frequency range from 1 MHz until 10 MHz, the system offers wideband medical ultrasonic acceptance. With -5 to +5 voltage head-room, it gives smooth result of ultrasound signal for medical purposes.